Coal-screening apparatus



Aug. 5 1924. Lsosm G.` S. JAXON COAL SCREENING APPARATUS Filed Sept. 16, 1922 2 Sheets-Sheet 2 @i MW j @mi l!!! E d Inv@ 732507 Patented Aug. 5, 1924.

UNITED STATES PATENT orales.

Geenen s; JAxoN, or HUNTINGTON, WEST nssIeNon To LINKBELT coin- PANY, or cIIIcneo, ILLINOIS, a coarofaATIoN or ILLINoIs.

COAL-SCREENING APPARATUS.l

. appncatm mea september 1e, 1922. serial No. 588,520.

To all whom z't may concern.:

Be it known that LGEORQE S. J AxoN, a citizen of the United States, residing at Huntington, in the county of Cabell and State of West Virginia, have invented a certain new and useful Improvement in Coal-Screening Apparatus, of which the following is aspecication. i

.My invention relates to an improvement in conveyors, and particularly to a conveying arrangement whereby coal or similar materials may'be conveyed for :storage or shipment with a minimum shock or breakage, in connection with an efficient rescreening apparatus. The invention particularly relates to a combination of conveyors adapted automatically to control the rescreening of sized'coal in the course of loading it into railroad cars, or any other receptacles, by means of .loading booms or other loading machinery. Other objects will appear from time to time in the course of the specification and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawings, wherein- F ig. 1 is a longitudinal section through ular Importance, but it comprlses the latermy loading and resereening device; A 0

Fig. 2 is a section contlnulng the devlce shown in Fig. 1;

Fig. 3 is a perspective of the entire screening and loading installation.

Likevparts are indicated by like characters throughout the drawings.

' A is any suitable screen or conveyor'havin thescreening elements ALA2 Aand the de ivery spout A3. The details of this screen or conveyor do not form part of the presentinvention and any suitable material delivery means might be used, for example, the endless conveyor A4.

l Mounted beneath the spout A3 vis an .endless conveyor'or` picking table comprlsmg the terminal sprockets B, the sprocket engaging rollers B, connected arched conveyin plates B, andthe tracks or supporting p ates B3 upon whlch the p1ck1n conveyor rides. Any suitable means, not ereln shown, are provided for supporting the operatives enga ed in the plcking operation.

Pivoted ad]acent the outer sprocket B,.at the delivery end of the conveyor, 1s the .1nclined chute C, having therein a rescreenmg element C1. The outer end of the chute is provided with a telescopic adjustable end section C2, and C3 is any suitable supporting means for adjusting the height of the outer y'end of the-chute to allow for its adjustment chute at a slight distance above the endless conveyor below described.

- Positioned beneaththe picking conveyor is a second endless conveyor comprising in part the terminal sprocket D, the plates Dl and D2, upon which ride respectively the upper and lower strands of the conveyor chain, vand the pivoted loading boom section D3, having at its end the sprocket D4 and being adjustably supported at its outer end by any suitable means D5. The loading boom is provided with an upper conveying plate D having an arcuate section D7 adapted to maintain a constant practical contact with the upper plate D1 of the horizontal section of the conveyor. The lower strand of the chain may be supported by any suitable plate or track D8.

The details of the chain are not of'partically disposed links E and cross flights E, adapted to convey material by scraping it along the supporting or conveying lates.

Positioned beneath the screen C11) inthe vpivot-ed trough C is a box or large spout F adapted to drop the fines delivered through the screen directly upon the plate D1. F1 is a gate in a plate D1 between the spout F and -the outer end of thechute C. It is removably mounted in the delivery spout F2, which is adapted to deliver material from the plate D1 to the plate D2. Fa is any suitable screen or bar arrangement intermediate the end of the chute C and the pivot point of the loading boom. Beneath it lie one or more material-receiving pockets F", in which are4 ing rollers G2 and a track G, but obviously any form of conveyor might be used. A similar form of conveyor is illustrated having an upper strand GA1 passing between the two plates D1 and D2 and the lower strand G5 beneath the plate D2. If desired, refuse conveyors or chutes Ge may be provided adjacent the picking conveyor, and adapted to deliver material to G4 or G5. The plate D2 is broken away, as at G8, above the conveyor G1, in order to permit delivery of material thereto, and it may also be provided with a removable gate or valve G7 above the conveyor G5.

In Figure 3 I illustrate a complete loading and screening assembly, in which two of the endless conveyor scribed, are associated with the screen A, onev receiving the lump which passes over the screen and is delivered by the spout A3, and the other receiving the screenings, for example, egg, which passes through the screening element A2 and is delivered by the spout A".

The screenings from the upper screening section A1 may be delivered to the slack chute J, which joins the run of mine chute J1 which is supplied through the valve J2 in the chute J3 between the screen A and the conveyor A4. The slack and the run of mine may subsequently be loaded directly on cars, or may be conveyed away for storage, by any suitable means not herein shown in detail.

K is a chute adapted to deliver screenings from the section A1 to the conveyor G, whence it may be delivered by the chute G10 to the plate D1.

L is a refuse bin into which material may be dischargedl by the conveyor G4, G5, and is provided with the delivery gate L1.

It will be realized that while I Vhave illustrated a working mechanism many changes might be made in the number, size, shape and disposition of parts, and that my description and drawings are to be taken as in a broad sense diagrammatic; in particular, the details of the conveyors, and the spacing, proportion and relation thereof, may be widely varied without departing from the spirit of my invention.

The use and operation of my invention are as follows: l.

I illustrate anysuitable means for delivering coal, screened or unscreened, to the upper or picking conveyor. Preferably I employ screens or conveyors which deliver or may deliver lump coal to the picking table. The upper conveyor or picker conveys the coal past the picking operators, who remove the refuse in the usual manner and dispose of it in any suitable way. The picked coal then passes over the chute C and the rescreenmg bars C1. The fines drop through the bars to the top plate D1 of the conveyor and are carried therealong by the chain icking tables, earlier de-.

flights in the direction shown by the arrow in Fig. 1. The fines may, 'if desired, be permitted to drop through the chute F2 of the gate F1, in which case they arecarried in an opposite direction by the lower strands of .the conveyor along the lower plate and may ets may e opened to permit deliveryto the lower plate, as above described in connection with the first screen. If the gates are closed, however, the pockets soon ll up and then the large coal passes on down the loading boom without such separation. In that case the rescreening pockets, filled with fine coal, form a solid trough direct to the car, to which the coal is delivered.

The conveyor G which is shown as single, but may be made multiple, may be employed to deliver to the opposite end of the conveyor coal of any suitable size--for example, of a grade intermediate between the ines and the lump. Nut and slack may be delivered to the conveyor thereby, and willthen pass along the upper plate beneath the rescreening device, the lines being rst deposited thereupon through the screen C1, and the lump coal being deposited on top of the mixture by thechute C. In such case, the gate F1 may be closed and the entire mixture delivered with the fines at the bottom, and the lump at the top is conveyed down to the loading boom horizontally graded, and is delivered in that condition to the car or other receptacle. v

It will thus be observed that the mechanism herein shown is particularly well adapted to prevent breakage of the coal, since the delivery is over endless conveyors and down a low angle chute. Furthermore, if desired, the fines may be -removed with peculiar efficiency and completeness. If mixed coal is desired, the mixture may bev delivered` graded in horizontal layers, with the heavy coal at the top toprevent the dispersal of the fines by wind or otherwise.

The rescreening process is entirely automatic, and the single conveyor simultaneously delivers the screened coal in one direction and the screenings in other and opposite direction.

An installation is illustrated in Fi ure 3 showing two of the picking units, alt ough a single one might be used or a greater number. The material to be screened and loaded, for example, run of the mine coal, is

-with ltwo screen areas, the screenings from the first of which are shown as being delivered to the slack chute J, although obviously a third picking unit. The second screening unit I illustrate as delivering its screenings to one picking conveyor, in which the screenings in this case are, for example, egg. The lump passes ove'r the end of the screen to another picking conveyor. The pivoted booms to which the material is delivered from Ythe picking area are preferably lined along tracks on which coal cars may be spotted and material passes down from the picking conveyor and to the boom as earlier herein described. The rescreenings from the various picking `units may be'delivered to the conveyor Gr4 and may be carried thereby to the bin L'. Material may also be carried from unit to unit by means of the conveyor G, the detailsof this connection being fully shown in Figure 1 and being earlier described.

To sum up, I illustrate an installation in which various grades of material may be first screened and then delivered to picking conveyors where the refuse may be removed,

the material passing thence over rescreening units and finally to loading booms. The screenings from one picking installation may be carried to a refuse bin or they may be carried for rescreening to another of the picking and screening unlts.

I claim:

1. In a material handling assembly, a`

plurality of substantially horizontal conveyors placed directly above one another, the lower bein an endless conveyor, a chute adapted to deliver material from the upper to the lower conveyor, a rescreening section .for the upper strand of the lower conveyor l positioned beyond the point of discharge of said chute, and a rescreening section intermediate the ends of said chute.

3. In a material handling assembly, a plurality of conveyors placed directly'above one another, the lower being an endless conveyor, a chute adapted to deliver material from the upper to the lowerlconveyor, a

,rescreening section for .the upper strand of the lower conveyor positioned beyond the 1 pointof discharge of said chute, a rescreening section intermediate the ends "of said chute, and a discharge element adapted to deliver material from the uppcrto the lower strand of the endless conveyor positioned on the opposite side of the chute end from the first mentioned rescreening element. I,

it.4 In a. material handling assembly, a

vplurality of conveyors arranged directly l above one another,.the lower being an endless conveyor, a pivoted discharge chute vconnecting said conveyors, a rescreening element in said ,discharge chute, a second rescreening elementfor the upper strand of the endless conveyor, and a valve in the upper strand yof said conveyor adapted to by-pass material which passes through and is received from the screening yarea of. the discharge chute to the lower strand of the conveyor.

5. In a material handling assembly, a plurality of superposed endless conveyors, an inclined chute adapted to deliver material from the upper to the lower conveyor, a pivoted loading boom adapted to co-operate with ythe lower conveyor, and additional `\to the lower conveyor.

' 7. In a material handling assembly, a plurality of superposed endless conveyors, an inclined chute adapted todeliver material from the up er to t'he lower conveyor, a pivoted loading oom adapted to co-operate with the lower conveyor, screening means intermediate the ends of said chute adapted to deliver material to the upper strand of the lower conveyor at a point above the point of delivery of the chute, a valve adapted to deliver material from the upper to the lower strand of said conveyor intermediate said screen and said point of delivery, and means for delivering material from said lower strand at a point separate from the normal delivery of material from the upper strand.

8. In a material handling assembly, a plurality of superposed endless conveyors, a pivoted inclined chute adapted to deliver material from the upper to the lower conveyor, a pivoted loading boom included within the circuit of the lower conveyor, screening means intermediate the ends of said chute adapted todeliver material to the upper strand of the lower conveyor at a point above the point of delivery of the chute, a valve adapted to deliver material from the upper to the lower strand of said ,conveyor intermediate said screen and said point 'of' delivery, and means for delivering material from said lower strand at a point separate from the l normal delivery of material from the upper therein ada ted to deliver material to the lower stran and means for controlling said valve.

10. In a material handling assembly, a plurality of Superposed conveyors, the lower of said conveyors being an endless conveyor, a discharge chute adapted to deliver material from the upper to the lower conveyor, a rescreening area in the upper strand of said lower conveyor, valves therebeneath adapted to deliver material to the lower strand of the conveyor, and means for closing said valves. i l

11. In a material handling assembly, a

plurality of superposed conveyors, the lower of said conveyors eing an endless conveyor, a discharge chute adapted to deliver material from the upper to the lower conveyor,

a rescreening area 1n the upper strand of said lower conveyor, valves therebeneath adapt,-

` ed to deliver material to the lower strand of the conveyor, means for closing said valves, land an additional r'escreening area intermediate the ends of said chute.

12. In a material handling assembly, a lower` substantially horizontal endless conveyor, an upper substantially horizontal conveyor overlying it, an inclined discharge chute adapted tofr deliver material from the upper to the lower conveyor, a screening member intermediate the ends of said chute adapted to deliver screened material to said endless conveyor, and an additional independent conveying element adapted to deliver material to said conveyor at a separate point.

13. In a material handling assembly, a lower endless conveyor, an upper conveyor overlying it, an inclined dischar e chute 'ada ted to deliver material from t e up er to tie lower conve or, a screening mem er intermediate the en s of said chute adaptedto deliver screened material to said endless oonveyor, and an additionalindependentconveying element adapted to deliver material to sald conveyor at a' separate point, the point of delivery of the chute being the nearest the discharge end of the conveyor and the independent conveyor being adapted to deliver material at a point farther removed from4 the discharge end of the conveyor.

14. In a material handling assembly comprising a primary screening element and means for supplying thereto the material to be screened, a plurality of secondary screening elements adapted to be supplied with different grades of material from the primary element, delivery means associated with the secondary screening means, and refuse discharge means comprising respectively a pivoted loading boom at the end of each secondary screening element and a refuse conveyor passing adjacent each secondary element vand means for discharging material thereto.

15. In a material handling assembly comprising a primary screening element and means for supplyin thereto the material to be screened, a plura ity of secondary screenin elements adapted to be supplied with dierent grades of material from the pri-l mary element, delivery means associated with the secondary screening means, and refuse discharge means, vand means for delivering the screenings of one secondary element to another secondary element for rescreening, comprising an endless conveyor, one strand of which 1s above and one below the secondary elements, and means for dis charging material from said elements to said conveyor and from said conveyor tok said elements.

16. In a coal handling assembly, a loading boom )comprising a substantially horizontal section, and yan end sectlon pivoted thereto, 'means for rotating the end section about a horizontal axis, an endless conveyor extending from end to end of the entire loading boom and surrounding both sections, means for feeding coal-.to the upper surface of the horizontal section, and la rescreening section intermediate ,the ends of said horizontal section.

17. In a coal handling assembly, a loading boom comprisinga substantially hori zontal section, and an end-section pivoted thereto, means for rotating-the end section about a horizontal axis, 'an endless conveyor Vextending from end to end of the entire conveyor `underlying, but projecting substantially beyond the end of the upper conveyor, and means for delivering material from the end of the upper conveyor to the lower conveyor, comprisin a pivoted chute adjustable as -to length and to angle, and a screening section intermediate the ends of said chute.

19. In a material handling assembly, a plurality of substantially horizontal endless conveyors arranged one above the other, means for delivering material from the upper conveyor to the lower conveyor comprising a chute pivoted adjacent one end. of the upper conveyor, and means for adjusting the length and angle of the chute,

and a screening element in said chute located intermediate its ends.

20. In a material handling assembly, a plurality of substantiall .horizontal conveyors, placed directly a ve one another, the lower of the two being an endless conveyor, a chute adapted to deliver material from the upper to the lower conveyor and means intermediate the end of said lower conveyor for delivering material from the up er to the lower strand of said conveyor.

igned at Chicago county of Cook and State of Illinois, this 14th day of September 1922.y

GEORGE S. JAXON. 

